Performance issues

biggles · Unread post by **biggles** » Wed Aug 20, 2008 4:05 am

Hi,

Installed ASL about a month ago on two servers. One is my main customer server (production), the other is my personal server which I also use as test bench for new installations.

Both servers have the same specification, but are VPS-based.

The problem is that my production server is much quicker then the personal server. When I use an Joomla-based installation (Joomla 1.5.6) on my personal server it can take up to 30 sec for a page to fully load. The Plesk management interface is also much slower on my personal server. The load for the production server is naturally much higher.

Could you help me explain the difference and/or help me find what's faulty?

Unread post by **scott** » Wed Aug 20, 2008 8:55 am

Whats the hardware like on the 2 systems?

biggles · Unread post by **biggles** » Wed Aug 20, 2008 9:12 am

Well, as I said, they are shared VPS server. The specification says
* 512MB Guaranteed RAM
* 1024MB Burst RAM

CPU usage is almost always very low (<10%).

Unread post by **scott** » Wed Aug 20, 2008 11:05 am

You'll need to find out what the CPU(s) are, amount of ram, disk speed, etc. Odds are one VPS's is just overloaded, or underpowered.

biggles · Unread post by **biggles** » Wed Aug 20, 2008 5:04 pm

OK, here comes the hardware specs.

Dell PowerEdge 6650/6850
* 4U with redundant cooling and 2 power supplies
* Intel Xeon MP 2.8/3.16* processors with 512kb L2 cache, and 2048kb L3 cache each
* 32768MB Mirrored Memory / 16384MB Usable Infineon DDR ECC RAM
* LSI MegaRAID 320-2X Ultra320 RAID controller with 512M Cache and battery backup
* HP StorageWorks Dual Controller / Dual Bus 4454R 3U U320 DAS
Disks:
* 4 x 36.4GB 15K Cheetah 15K.4 for OS and Shared Software (RAID 10)
* 14 x 72.8GB 15K Cheetah 15K.4 for VPS Data (RAID 10)
* Dell PowerEdge RAS DRAC with Dell OM agents

The strange thing is that the memory usage increased dramatically when I installed ASL. Now, after ASL, there are 7 httpd daemons each taking about 14% of the available RAM. On my third server, not exactly the same configuration, but very close, the httpd deamons takes 1-2% RAM each.

And there wasn't any performance issues at all until I installed ASL. What is it that ASL does with the httpd that make it consume that much memory?

*edit*
Below is the graph for CPU and memory usage. As you see httpd memory usage became measurable in the middle of July, just when I installed ASL.